He is a one-armed man.

I saw a one-horse carriage on the street.

He is able to walk even though he is one-legged.

I love a good one-liner.

He is a one-man band.

She wore a beautiful one-piece swimsuit at the beach.

I had a one-time opportunity to visit the ancient ruins.

He always tries to one-up his colleagues.

He always tries to outdo his colleagues to show his one-upmanship.

This road is one-way, so you can only go in one direction.